1) Just create a text file and put in the following
2)Then save the file as EML file extension
3)stop the transport sevrice
4)copy and paste the file to the pickup folder
If you hold contol-v it will paste it constantly, then just monitor the folder item count until it’s pastes it to the amount of messages you want to queue
More information on http://support.microsoft.com/kb/297700
Thanks to my colleague and buddy Ed Bringas (former US Escalation Engineer, now Canadian Senior PFE) for this other tip !